@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;0,700;1,400&family=IBM+Plex+Sans:wght@300;400;500;600;700&family=IBM+Plex+Serif:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&family=Noto+Serif+SC:wght@300;400;500;600;700&display=swap');

:root {
    --bg: #ffffff;
    --ink: #111111;
    --ink-secondary: #555555;
    --ink-muted: #888888;
    --rule: #e5e5e5;
    --tag-bg: #f3f3f3;

    --font-sans: 'IBM Plex Sans', -apple-system, sans-serif;
    --font-serif: 'IBM Plex Serif', 'Noto Serif SC', Georgia, serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg);
    color: var(--ink);
    font-family: var(--font-sans);
    line-height: 1.75;
    padding: 0 24px;
}

.layout {
    max-width: 920px;
    margin: 0 auto;
    padding: 72px 0 120px 0;
}

/* 顶部导航 */
.site-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 96px;
}

/* Logo 采用 IBM Plex Mono Bold */
.brand {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.2rem;
    letter-spacing: -0.03em;
    color: var(--ink);
    text-decoration: none;
    cursor: pointer;
}

.brand span {
    font-weight: 300;
    color: var(--ink-muted);
}

.site-nav {
    display: flex;
    gap: 28px;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
}

.site-nav a {
    color: var(--ink-secondary);
    text-decoration: none;
    cursor: pointer;
    transition: color 0.15s ease;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--ink);
    text-decoration: underline;
    text-underline-offset: 6px;
}

/* 首页极致宣言区块 */
.manifesto-block {
    max-width: 720px;
    margin-top: 40px;
}

.eyebrow {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-muted);
    margin-bottom: 24px;
}

.hero-thesis {
    font-family: var(--font-serif);
    font-size: 2.5rem;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: -0.01em;
    margin-bottom: 36px;
    color: var(--ink);
}

.hero-thesis em {
    font-style: italic;
    font-weight: 400;
}

.manifesto-copy p {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 400;
    line-height: 1.95;
    color: var(--ink-secondary);
    margin-bottom: 24px;
}

.signature {
    margin-top: 48px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--ink);
}

.easter-egg {
    color: var(--ink);
    text-decoration: none;
    cursor: pointer;
}
.easter-egg:hover {
    background-color: #111;
    color: #fff;
}

/* Works 页面与通用容器 */
.page-container {
    max-width: 760px;
}

.page-title-area {
    margin-bottom: 40px;
    border-bottom: 1px solid var(--rule);
    padding-bottom: 24px;
}

.page-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.page-subtitle {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 300;
    color: var(--ink-muted);
}

/* 过滤栏 */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 6px 12px;
    background: var(--tag-bg);
    border: none;
    cursor: pointer;
    color: var(--ink-secondary);
    transition: all 0.15s;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--ink);
    color: #fff;
}

/* 列表行 */
.article-index {
    display: flex;
    flex-direction: column;
}

.index-row {
    display: grid;
    grid-template-columns: 100px 1fr auto;
    align-items: baseline;
    gap: 20px;
    padding: 22px 0;
    border-bottom: 1px solid var(--rule);
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: opacity 0.15s ease;
}

.index-row:first-child {
    border-top: 1px solid var(--rule);
}

.index-row:hover {
    opacity: 0.6;
}

.index-date {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-muted);
}

.index-main {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.index-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--ink);
}

.index-category {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--ink-muted);
    text-transform: uppercase;
}

.index-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.tag-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background: var(--tag-bg);
    padding: 2px 6px;
    color: var(--ink-secondary);
}

/* 全文阅读器视图 */
.back-btn {
    font-family: var(--font-mono);
    font-size: 0.825rem;
    font-weight: 500;
    color: var(--ink);
    text-decoration: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 36px;
}

.back-btn:hover {
    text-decoration: underline;
    text-underline-offset: 5px;
}

.reader-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--ink-muted);
    margin-bottom: 16px;
    display: flex;
    gap: 16px;
}

.reader-title {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    line-height: 1.35;
    margin-bottom: 14px;
}

.reader-subtitle {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 300;
    color: var(--ink-secondary);
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--rule);
}

.keywords-row {
    margin-bottom: 36px;
    display: flex;
    gap: 8px;
    align-items: center;
}

.keyword-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--ink-muted);
    background: var(--tag-bg);
    padding: 3px 8px;
}

.reader-body p {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.95;
    color: var(--ink);
    margin-bottom: 26px;
}

.reader-body blockquote {
    border-left: 2px solid var(--ink);
    padding-left: 20px;
    margin: 32px 0;
    font-family: var(--font-serif);
    font-style: italic;
    font-weight: 300;
    color: var(--ink-secondary);
}

/* 页脚 */
.site-footer {
    margin-top: 140px;
    padding-top: 28px;
    border-top: 1px solid var(--rule);
    display: flex;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 300;
    color: var(--ink-muted);
}

@media (max-width: 720px) {
    .layout { padding: 44px 0 80px 0; }
    .hero-thesis { font-size: 1.8rem; }
    .index-row { grid-template-columns: 1fr; gap: 6px; }
    .index-tags { justify-content: flex-start; }
}